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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	16 Months Ended
	Nov. 30, 2016	Nov. 30, 2016	Nov. 30, 2016	Jul. 22, 2015
Stockholders' Equity Attributable to Parent [Abstract]
Additional authorization July 2015				$ 50.0
Less repurchases made under the authorization as of November 30, 2016	$ (6.0)	$ (6.0)	$ (10.5)
Remaining Board authorization at November 30, 2016	$ 39.5	$ 39.5	$ 39.5

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- Definition

Stock Repurchase Program, Increase in Authorized Amount

+ References

No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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